class_docstr: Store the group information created via `create_collective_group`.
  
  Note: Should be used as a NamedActor.
code: def __init__(self):
      self.ids = None
      self.world_size = -1
      self.rank = -1
      self.backend = None
  
file_path: ray/python/ray/util/collective/util.py
imports: import ray
  import logging
label_desc: Use image node_id 1 to create a new Info object  with example: obj = Info()